AT45DB161E datasheet(11/80 Pages) DIALOG

11 / 80 page

AT45DB161E

DS-AT45DB161E–8782N–03-2021

Device Operation

The device operation is controlled by instructions from the host processor. The list of instructions and their

associated opcodes are contained in Table 16-1, on page 45, through Table 16-4, on page 46. A valid instruction

starts with the falling edge of CS followed by the appropriate 8-bit opcode and the desired buffer or main memory

address location. While the CS pin is low, toggling the SCK pin controls the loading of the opcode and the desired

buffer or main memory address location through the SI (Serial Input) pin. All instructions, addresses, and data are

transferred with the Most Significant Bit (MSB) first.

Three address bytes are used to address memory locations in either the main memory array or in one of the SRAM

buffers. The three address bytes are comprised of a number of dummy bits and a number of actual device address

bits, with the number of dummy bits varying depending on the operation being performed and the selected device

page size. Buffer addressing for the standard DataFlash page size (528 bytes) is referenced in the datasheet using

the terminology BFA9 - BFA0 to denote the 10 address bits required to designate a byte address within a buffer.

The main memory addressing is referenced using the terminology PA11 - PA0 and BA9 - BA0, where PA11 - PA0

denotes the 12 address bits required to designate a page address, and BA9 - BA0 denotes the 10 address bits

required to designate a byte address within the page. Therefore, when using the standard DataFlash page size, a

total of 22 address bits are used.

For the “power of 2” binary page size (512 bytes), the buffer addressing is referenced in the datasheet using the

conventional terminology BFA8 - BFA0 to denote the nine address bits required to designate a byte address within

a buffer. Main memory addressing is referenced using the terminology A20 - A0, where A20 - A9 denotes the 12

address bits required to designate a page address, and A8 - A0 denotes the nine address bits required to

designate a byte address within a page. Therefore, when using the binary page size, a total of 21 address bits are

used.

AT45DB161E Datasheet(PDF) 11 Page - Dialog Semiconductor